Bandwidth information notification method, network node and communication system

ABSTRACT

A bandwidth information notification method includes: obtaining bandwidth information of a microwave link; and sending a plurality of OAM messages carrying the bandwidth information to an endpoint, wherein first one or more OAM messages of the plurality of OAM messages are sent more quickly than at least one of the rest of the plurality of OAM messages.

This application is a continuation of U.S. patent application Ser. No.13/371,795, filed on Feb. 13, 2012, which is a continuation ofInternational Application No. PCT/CN2010/076043, filed on Aug. 17, 2010,which claims priority to Chinese Patent Application No. 200910167223.6,filed on Aug. 21, 2009. The afore-mentioned patent applications arehereby incorporated by reference in their entireties.

TECHNICAL FIELD

The present invention relates to the field of communicationtechnologies, and in particular, to a bandwidth information notificationmethod, a network node, and a communication system.

BACKGROUND

Internet Protocol (IP: Internet Protocol) services increase rapidly, andbecome a mainstream service type by replacing time division multiplexing(TDM: Time Division Multiplexing) services gradually. And networktraffic also increases rapidly. Traditional Synchronous DigitalHierarchy (SDH: Synchronous Digital Hierarchy)/Multi-Service TransportPlatform (MSTP: Multi-Service Transport Platform) equipment cannot makefull use of a statistic multiplexing feature of a packet service, andcannot meet an increasingly stringent bandwidth requirement in anotheraspect. Therefore, SDH equipment is being replaced by packet transportnetwork (PTN: Packet Transport Network) equipment.

Meanwhile, microwave equipment is widely applied in the operator'network. Currently, SDH microwave equipment and Plesiochronous DigitalHierarchy (PDH: Plesiochronous Digital Hierarchy) microwave equipmentare commonly deployed. As PTN equipment replaces SDH equipment, packetmicrowave equipment begins to replace SDH/PDH microwave equipmentaccordingly, and is widely applied in recent years. The packet microwaveequipment refers to that packet equipment having one or more microwaveinterfaces.

A microwave link differs from a fiber link in that the microwave linkcan perform adaptive modulation (AM: Adaptive Modulation) as the weatherchanges, which leads to a bandwidth change of the microwave link.Moreover, a bandwidth change is determinate. A transport networkgenerally requires quite high capability of operation, administrationand maintenance (OAM: Operation, Administration and Maintenance).However, PTN OAM functions at present are only some general operations.

The PTN OAM functions at present are only some general operations, andtherefore, the microwave link after performing adaptive modulationcannot be notified to an endpoint of a service connection which passesthrough the microwave link, which causes service congestion since theendpoint of the service connection still performs traffic controlaccording to the bandwidth information before applying adaptivemodulation.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a bandwidth informationnotification method, a network node, and a communication system, so thata service connection endpoint which passes through a link may obtaincurrent bandwidth information of the link.

An embodiment of the present invention provides a bandwidth informationnotification method, including:

obtains bandwidth information of a microwave link; and sends a pluralityof OAM messages carrying the bandwidth information to an endpoint,wherein first one or more OAM messages of the plurality of OAM messagesare sent more quickly than at least one of the rest of the plurality ofOAM messages.

An embodiment of the present invention further provides a network node,including:

an obtaining unit, which is configured to obtain bandwidth informationof a microwave link;

a sending unit, which is configured to send a plurality of OAM messagescarrying the bandwidth information obtained by the obtaining unit to anendpoint, wherein first one or more OAM messages of the plurality of OAMmessages are sent more quickly than at least one of the rest of theplurality of OAM messages.

An embodiment of the present invention further provides a communicationsystem, includes a network node and an endpoint, wherein:

the network node is configured to obtain bandwidth information of amicrowave link, and to send a plurality of OAM messages carrying thebandwidth information to the endpoint, wherein first OAM messages of theplurality of OAM messages are sent more quickly than at least one of therest of the plurality of OAM messages, and

1. the endpoint is configured to adjust a service policy according tothe bandwidth information.

An embodiment of the present invention further provides A non-transitoryprocessor-readable storage medium which have stored thereonprocessor-executable instructions configured to cause a processor toperform operations comprising:

obtaining, by a network node, bandwidth information of a microwave link;and

sending, by the network node, a plurality of OAM messages carrying thebandwidth information to an endpoint, wherein first one or more OAMmessages of the plurality of OAM messages are sent more quickly than atleast one of the rest of the plurality of OAM messages.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention more clearly, the accompanying drawings required fordescribing the embodiments are introduced briefly in the following.Apparently, the accompanying drawings in the following description areonly some embodiments, and persons of ordinary skill in the art may alsoderive other drawings from these accompanying drawings without makingany creative effort.

FIG. 1 is a flowchart of a bandwidth information notification methodaccording to a first embodiment of the present invention;

FIG. 2 is a flowchart of a bandwidth information notification methodaccording to a second embodiment of the present invention;

FIG. 3 is a flowchart of a service processing method according to anembodiment of the present invention;

FIG. 4 is a topology diagram of an end-to-end connection in a bandwidthinformation notification method according to a third embodiment and afourth embodiment of the present invention;

FIG. 5 is a structural diagram of a network node according to a firstembodiment of the present invention;

FIG. 6 is a structural diagram of a network node according to a secondembodiment of the present invention; and

FIG. 7 is a structural diagram of a network node according to a thirdembodiment of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

The technical solutions in the embodiments of the present invention aredescribed clearly and fully in the following with reference to theaccompanying drawings in the embodiments of the present invention.Apparently, the embodiments to be described are merely a part ratherthan all of the embodiments of the present invention. All otherembodiments obtained by those skilled in the art without any creativeeffort shall fall within the protection scope of the present invention.

A bandwidth information notification method provided in an embodiment ofthe present invention is described first. FIG. 1 illustrates a procedureof a bandwidth information notification method according to a firstembodiment. In this embodiment, a processing procedure of a network nodethat is attached by a microwave link is described, which includes:

101: Detect a current modulation mode of the microwave link.

The detection may be through real-time monitoring or periodicaldetection.

102: Obtain bandwidth information of the microwave link in the currentmodulation mode.

A bandwidth of the microwave link is different in different modulationmodes, and the bandwidth of the microwave link in each modulation modeis determinate. Therefore, corresponding bandwidth information may beobtained once the current modulation mode of the microwave link isdetermined. The obtained bandwidth information may be bandwidth levelindication information or modulation mode information.

For example, an optimal modulation mode of the microwave link is 64Quadrature Amplitude Modulation (QAM: Quadrature Amplitude Modulation),and a bandwidth in this modulation mode is 1 Gbps; when a modulationmode is 16 QAM, a bandwidth is 0.6 Gbps; therefore, when a modulationmode is 64 QAM, bandwidth level indication information may be 1 Gbps;when the modulation mode is 16 QAM, the bandwidth level indicationinformation may be 0.6 Gbps; when the modulation mode is 64 QAM,modulation mode information may be a 64 QAM modulation mode; and whenthe modulation mode is 16 QAM, the modulation mode information may be a16 QAM modulation mode. In an embodiment of the present invention, thebandwidth indication information may also not be a specific bandwidthvalue, but a number that represents the bandwidth value. For example, 7represents 1 Gbps, and 5 represents 0.6 Gbps. Therefore, in the case ofthe 64 QAM modulation mode, the bandwidth level indication informationmay be 7; and in the case of the 16 QAM modulation mode, the bandwidthlevel indication information may be 5. Specifically, which numberrepresents which bandwidth value may be configured as required.

103: Send the bandwidth information to an endpoint of a serviceconnection through the service connection which passes through themicrowave link, so that the endpoint of the service connection adjusts aservice policy according to the bandwidth information.

The microwave link is one of the multiple links that are passed throughby the service connection. That is, at least one link between twonetwork nodes of the service connection is a microwave link. The serviceconnection may be an Ethernet connection, such as a Virtual Local AreaNetwork (VLAN: Virtual Local Area Network) connection, and a ProviderBackbone Bridge-Traffic Engineering Ethernet Switch Path (PBB-TE ESP:Provider Backbone Bridge Traffic Engineering Ethernet Switch Path)connection; and the service connection may also be a non-Ethernetconnection, such as a Multi Protocol Label Switch Label Switched Path(MPLS LSP: Multi Protocol Label Switch Label Switched Path) connection,and may also be a Label Switched Path (LSP: Label Switched Path)connection.

The bandwidth information is sent by a network node that is attached bythe microwave link through a bandwidth notification message. Thebandwidth notification message may be an Alarm IndicationSignal/Suppression (AIS: Alarm Indication Signal/Suppression) message ora new Operation, Administration, and Maintenance (OAM: Operation,Administration, and Maintenance) message.

In an embodiment of the present invention, bandwidth information may besent to an endpoint of a service connection which passes through amicrowave link through an AIS message. An existing AIS message may beextended, so that the AIS message can carry the bandwidth information.

In another embodiment of the present invention, bandwidth informationmay also be sent through a new OAM message. The new OAM message may be anewly defined OAM message, and may also be a message obtained byextending another OAM message.

It can be known from the preceding that, in this embodiment, the networknode that is attached by the microwave link may obtain the bandwidthinformation of the microwave link in the current modulation mode, andsends the bandwidth information to the endpoint of the serviceconnection which passes through the microwave link. Therefore, theendpoint of the service connection may adjust the service policyaccording to the bandwidth information, so that a bandwidth of themicrowave link can meet a service requirement, and service congestioncan be avoided.

FIG. 2 illustrates a procedure of a bandwidth information notificationmethod according to a second embodiment. In this embodiment, aprocessing procedure of a network node that is attached by a microwavelink is described, which includes:

201: Detect a current modulation mode of the microwave link.

The detection may be real-time monitoring or periodical detection.

202: Judge whether the current modulation mode is lower than an optimalmodulation mode; if the current modulation mode is lower than theoptimal modulation mode, proceed to step 203; and if the currentmodulation mode is not lower than the optimal modulation mode, proceedto step 201.

203: Obtain bandwidth information of the microwave link in the currentmodulation mode.

Specific execution may be made reference to step 102.

204: Send the bandwidth information to an endpoint of a serviceconnection through the service connection which passes through themicrowave link, so that the endpoint of the service connection adjusts aservice policy according to the bandwidth information.

Specific execution may be made reference to step 103.

It can be known from the preceding that, in this embodiment, the networknode that is attached by the microwave link may obtain the bandwidthinformation of the microwave link in the current modulation mode whenthe current modulation mode of the microwave link is lower than theoptimal modulation mode, and sends the bandwidth information to theendpoint of the service connection which passes through the microwavelink. Therefore, the endpoint of the service connection may adjust theservice policy according to the bandwidth information, so that abandwidth of the microwave link can meet a service requirement, andservice congestion can be avoided.

In the bandwidth information notification method provided in the secondembodiment of the present invention, the network node that is attachedby the microwave link obtains and sends the bandwidth information whenthe current modulation mode of the microwave link is detected as beinglower than the optimal modulation mode; and if it is detected that thecurrent modulation mode of the microwave link is the optimal modulationmode, bandwidth information may be stopped from being sent to theendpoint of the service connection which passes through the microwavelink, so that the endpoint of the service connection uses a normalservice policy to perform service processing, and ensures that amicrowave link resource is fully utilized.

FIG. 3 illustrates a procedure of a service processing method accordingto an embodiment. In this embodiment, a processing procedure of anendpoint of a service connection which passes through a microwave linkis described, which includes:

301: Receive bandwidth information of the microwave link in a currentmodulation mode, where the bandwidth information is sent by a networknode that is attached by the microwave link.

In an embodiment of the present invention, the received bandwidthinformation may be sent periodically or non-periodically by the networknode that is attached by the microwave link when the network nodedetects that the current modulation mode is lower than an optimalmodulation mode.

302. According to a preset corresponding relationship between bandwidthinformation and a service policy, determine a service policycorresponding to the received bandwidth information.

The corresponding relationship between the bandwidth information and theservice policy may be preset, so that the service policy correspondingto the bandwidth information may be determined after the bandwidthinformation is received. The service policy may specifically be aquality of service (QoS: Quality of Service) policy, or an accesscontrol policy, or a service switching policy.

For example, in an embodiment of the present invention, a correspondingrelationship may be preset between bandwidth information and a QoSpolicy, and therefore, after the bandwidth information is received, theQoS policy corresponding to the received bandwidth information may bedetermined, so that service processing is performed according to thedetermined QoS policy. Specifically, the endpoint of the serviceconnection may preset a corresponding relationship between bandwidthinformation and a waterline of a service buffer area. For example, whena bandwidth of the microwave link is larger, a larger service bufferarea may be set; and when a bandwidth of the microwave link is smaller,a smaller service buffer area may be set. Therefore, after receiving thebandwidth information, the endpoint of the service connection adjuststhe waterline to a position corresponding to a bandwidth that isindicated by the bandwidth information. In this way, a size of theservice buffer area is adjusted, and the QoS policy is adjusted.

In another embodiment of the present invention, a correspondingrelationship may be preset between bandwidth information and a serviceswitching policy, and therefore, after the bandwidth information isreceived, the service switching policy corresponding to the receivedbandwidth information may be determined, so that a service is switchedover to a protection path according to the determined service switchingpolicy. The service may be partly or fully switched over to theprotection path according to different service switching policies.

If multiple different bandwidth information are received, where themultiple different bandwidth information are corresponding to multipledifferent bandwidths, bandwidth information corresponding to thesmallest bandwidth is selected.

303: Perform service processing according to the service policycorresponding to the received bandwidth information.

Specifically, the service processing may be performed according to theQoS policy corresponding to the bandwidth information, or the accesscontrol policy corresponding to the bandwidth information, or theservice switching policy corresponding to the bandwidth information.

It can be known from the preceding that, in this embodiment, theendpoint of the service connection which passes through the microwavelink receives the bandwidth information of the microwave link in thecurrent modulation mode, where the bandwidth information is sent by thenetwork node that is attached by the microwave link. The service policyis adjusted according to the bandwidth information, so that a bandwidthof the microwave link can meet a service requirement, and servicecongestion can be avoided.

In another embodiment of the present invention, the network node that isattached by the microwave link obtains and sends the bandwidthinformation only when the current modulation mode of the microwave linkis detected as being lower than the optimal modulation mode; and if theendpoint of the service connection which passes through the microwavelink receives no bandwidth information within preset time, it may beconsidered that the current modulation mode of the microwave link is theoptimal modulation mode, so that the service processing is performed byusing a normal service policy, thus ensuring that a microwave linkresource is fully utilized. The normal service policy may be a normalQoS policy, or a normal access control policy, or a normal serviceswitching policy. When the service policy is a normal service switchingpolicy, the service is switched over from a protection path back to aworking path.

With specific examples, a bandwidth information notification method in athird embodiment of the present invention is described as follows:

FIG. 4 illustrates a topology of an end-to-end service connection in abandwidth information notification method according to the thirdembodiment. As shown in FIG. 4, the service connection passes through anetwork node A, a network node B, a network node C, a network node D, anetwork node E, and a network node F. A link between the network node Cand the network node D is a microwave link, and the network node A andthe network node F are endpoints of the service connection. In someembodiments, the link between the network node C and the network node Dis a microwave link, but a principle of the present invention may beapplicable to any type of communication links, for example, a satellitelink with a variable bandwidth, a passive optical network link, and adigital subscriber line link.

It is assumed that, in a normal situation, the microwave link betweenthe network node C and the network node D adopts a 64 QAM modulationmode, and a corresponding bandwidth is 1 Gbps; when the environmentchanges, for example, when it rains, the modulation mode is lowered to a16 QAM modulation mode, and the bandwidth decreases to 0.6 Gbps.

When detecting that a current modulation mode is lower than an optimalmodulation mode 64 QAM, the network node C and the network node D sendan AIS message through a service connection (may specifically be anLSP), where the AIS message is extended to carry bandwidth informationof the microwave link in the current modulation mode. Specifically, thenetwork node C may send the AIS message to the endpoint A or theendpoint F, and definitely, the network node C may also send the AISmessage to both the endpoint A and the endpoint F; and the network nodeD sends the AIS message to the endpoint A or the endpoint F, anddefinitely, the network node D may also send the AIS message to both theendpoint A and the endpoint F.

Specifically, the AIS message may be extended to carry a link bandwidthtype-length-value (link bandwidth TLV: link bandwidth Type-Length-Value)object, and the link bandwidth TLV object carries the bandwidthinformation of the microwave link in the current modulation mode.Specifically, the bandwidth information may be bandwidth levelindication information or modulation mode information.

In this embodiment, the network node that is attached by the microwavelink may carry the bandwidth information through the AIS message, andmay also carry the bandwidth information through another specific typeof message, such as a new OAM message. The AIS message and anotherspecific type of message are uniformly understood as bandwidthnotification messages. After receiving the bandwidth information of themicrowave link in the current modulation mode, the network node A andthe network node F may adjust a service policy according to thebandwidth information.

A specific implementation mode may be: A corresponding relationship ispreset between bandwidth information and a QoS policy on the networknode A and the network node F. When receiving the bandwidth informationof the microwave link in the current modulation mode, the network node Aand the network node F enable a QoS policy corresponding to thebandwidth information, and therefore, services are controlled atingresses (the endpoint A and the endpoint F), so that when the servicepasses through the microwave link, a congestion situation is avoided.

Another specific implementation mode may be: a correspondingrelationship is preset between bandwidth information and a serviceswitching policy on the network node A and the network node F. Whenreceiving the bandwidth information of the microwave link in the currentmodulation mode, the network node A and the network node F enable aservice switching policy corresponding to the bandwidth information, sothat a service is partly or fully switched over to a protection path.

When the environment becomes better, and the microwave link is recoveredto the optimal modulation mode, the network node C and the network nodeD stop sending the AIS message.

When no AIS message that carries the bandwidth information is receivedin preset time, the endpoint A and the endpoint F may use a normalservice policy to perform service processing.

It can be known from the preceding that, in this embodiment, the networknode that is attached by the microwave link may obtain the bandwidthinformation of the microwave link in the current modulation mode whenthe current modulation mode of the microwave link is lower than theoptimal modulation mode, and sends the bandwidth information to theendpoint of the service connection which passes through the microwavelink. Therefore, the endpoint of the service connection may adjust theservice policy according to the bandwidth information, so that abandwidth of the microwave link can meet a service requirement, andservice congestion can be avoided.

A bandwidth information notification method provided in a fourthembodiment of the present invention is described by still taking thescenario described in FIG. 4 as an example. As shown in FIG. 4, anend-to-end service connection passes through a network node A, a networknode B, a network node C, a network node D, a network node E, and anetwork node F. A link between the network node C and the network node Dis a microwave link, and the network node A and the network node F areendpoints of the service connection.

It is assumed that, in a normal situation, the microwave link betweenthe network node C and the network node D adopts a 64 QAM modulationmode, and a corresponding bandwidth is 1 Gbps; when the environmentchanges, for example, when it rains, the modulation mode is lowered to a16 QAM modulation mode, and the bandwidth decreases to 0.6 Gbps.

The network node C and the network node D detect a current modulationmode in real time, and send a new OAM message periodically through aservice connection (may specifically be an LSP) in a normal period. Thenew OAM message carries bandwidth information of the microwave link inthe current modulation mode. Specifically, the network node C may send anew OAM message to the endpoint A or the endpoint F, and definitely, thenetwork node C may also send the new OAM message to both the endpoint Aand the endpoint F; and the network node D sends a new OAM message tothe endpoint A or the endpoint F, and definitely, the network node D mayalso send the new OAM message to both the endpoint A and the endpoint F.When it is detected that the modulation mode changes, several OAMmessages are sent with a higher frequency, so as to notify the change ofthe bandwidth in time. Subsequently, the OAM messages are sent in anormal period. For example, a normal period of sending a new OAM messageis 1 second; and when the bandwidth changes, the first three frames ofthe new OAM message are sent in a period of 10 milliseconds, andsubsequently, a period of sending a new OAM message is restored to 1second.

Specifically, the new OAM message and the AIS message are uniformlyunderstood as bandwidth notification messages. The new OAM message maycarry a link bandwidth TLV object, and the link bandwidth TLV objectcarries bandwidth information. Specifically, the bandwidth informationmay be bandwidth level indication information or modulation modeinformation.

A specific implementation mode may be: a corresponding relationship ispreset between bandwidth information and a QoS policy on the networknode A and the network node F. When receiving the bandwidth informationof the microwave link in the current modulation mode, the network node Aand the network node F enable a QoS policy corresponding to thebandwidth information, and therefore, services are controlled atingresses (the endpoint A and the endpoint F), so that when the servicepasses through the microwave link, a congestion situation is avoided.

Another specific implementation mode may be: a correspondingrelationship is preset between bandwidth information and a serviceswitching policy on the network node A and the network node F. Whenreceiving the bandwidth information of the microwave link in the currentmodulation mode, the network node A and the network node F enable aservice switching policy corresponding to the bandwidth information, sothat a service is partly or fully switched over to a protection path.

It can be known from the preceding that, in this embodiment, the networknode that is attached by the microwave link may obtain the bandwidthinformation of the microwave link in the current modulation mode whenthe current modulation mode of the microwave link is lower than theoptimal modulation mode, and sends the bandwidth information to theendpoint of the service connection which passes through the microwavelink. Therefore, the endpoint of the service connection may adjust theservice policy according to the bandwidth information, so that abandwidth of the microwave link can meet a service requirement, andservice congestion can be avoided.

The following describes a network node provided in an embodiment of thepresent invention. FIG. 5 illustrates a structure of a network nodeaccording to a first embodiment. The network node includes:

a detecting unit 501, configured to detect a current modulation mode ofa microwave link;

an obtaining unit 502, configured to obtain bandwidth information of themicrowave link in the current modulation mode that is detected by thedetecting unit 501; and

a sending unit 503, configured to send the bandwidth informationobtained by the obtaining unit 502 to an endpoint of a serviceconnection through the service connection which passes through themicrowave link, so that the endpoint of the service connection adjusts aservice policy according to the bandwidth information.

It can be known from the preceding that, in this embodiment, the networknode may obtain the bandwidth information of the microwave link in thecurrent modulation mode, and sends the bandwidth information to theendpoint of the service connection which passes through the microwavelink. Therefore, the endpoint of the service connection may adjust theservice policy according to the bandwidth information, so that abandwidth of the microwave link can meet a service requirement, andservice congestion can be avoided.

FIG. 6 illustrates a structure of a network node according to a secondembodiment. The network node includes:

a detecting unit 601, configured to detect a current modulation mode ofa microwave link;

a judging unit 602, configured to judge whether the current modulationmode that is detected by the detecting unit 601 is lower than an optimalmodulation mode;

an obtaining unit 603, configured to, when the judging unit 602 judgesthat the current modulation mode that is detected by the detecting unitis lower than the optimal modulation mode, obtain bandwidth informationof the microwave link in the current modulation mode that is detected bythe detecting unit; and

a sending unit 604, configured to send the bandwidth informationobtained by the obtaining unit 603 to an endpoint of a serviceconnection through the service connection which passes through themicrowave link, so that the endpoint of the service connection adjusts aservice policy according to the bandwidth information.

In an embodiment of the present invention, when the judging unit 602judges that the current modulation mode is the optimal modulation mode,the sending unit 604 stops sending the bandwidth information to theendpoint of the service connection which passes through the microwavelink, so that the endpoint of the service connection uses a normalservice policy to perform service processing.

It can be known from the preceding that, in this embodiment, the networknode may obtain the bandwidth information of the microwave link in thecurrent modulation mode when the current modulation mode of themicrowave link is lower than the optimal modulation mode, and sends thebandwidth information to the endpoint of the service connection whichpasses through the microwave link. Therefore, the endpoint of theservice connection may adjust the service policy according to thebandwidth information, so that a bandwidth of the microwave link canmeet a service requirement, and service congestion can be avoided.

FIG. 7 illustrates a structure of a network node according to a thirdembodiment. The network node may include:

a receiving unit 701 configured to receive bandwidth information of amicrowave link in a current modulation mode, where the bandwidthinformation is sent by a network node that is attached by the microwavelink, and

a determining unit 702 configured to, according to a presetcorresponding relationship between bandwidth information and a servicepolicy, determine a service policy corresponding to the bandwidthinformation that is received by the receiving unit 701.

In an embodiment of the present invention, the determining unit 702 isfurther configured to determine the service policy as a normal servicepolicy when the receiving unit 701 does not receive the bandwidthinformation in preset time.

A processing unit 703 is configured to perform service processingaccording to the service policy that is determined by the determiningunit 702.

It can be known from the preceding that, in this embodiment, the networknode may receive the bandwidth information of the microwave link in thecurrent modulation mode, where the bandwidth information is sent by thenetwork node that is attached by the microwave link, and the servicepolicy is adjusted according to the bandwidth information, so that abandwidth of the microwave link can meet a service requirement, andservice congestion can be avoided.

An embodiment of the present invention further provides a communicationsystem. The communication system includes a network node provided in anembodiment of the present invention.

An information exchange between each module in the preceding apparatusand system and an implementation process in the apparatus and system arebased on the same conception with the method embodiment of the presentinvention, and therefore, the specific content may be made reference tothe description of the method embodiment of the present invention, whichis not further described here.

Persons of ordinary skill in the art may understand that all or part ofthe procedures of the method in the preceding embodiments may beimplemented by a program instructing relevant hardware including aprocessor. The program may be stored in a computer readable storagemedium. When the program runs, the procedures of the method in thepreceding embodiments. The storage medium may be a magnetic disk, aread-only memory (Read-Only Memory, ROM), or a random access memory(Random Access Memory, RAM).

The bandwidth information notification method, the network node, and thecommunication system that are provided in the embodiments of the presentinvention are described in detail in the preceding. The description ofthe preceding embodiments is only used for helping to understand themethod and idea of the present invention; meanwhile, those skilled inthe art may make variations to the specific implementation and theapplication scope according to the idea of the present invention. Inconclusion, the content of this specification shall not be construed asa limitation to the present invention.

What is claimed is:
 1. A bandwidth information notification method,comprising: obtaining, by a network node, bandwidth information of amicrowave link; determining, by the network node according to theobtained bandwidth information, that a bandwidth of the microwave linkhas changed; in response to determining that the bandwidth of themicrowave link has changed, sequentially sending, by the network node, afirst plurality of operation, administration and maintenance (OAM)messages carrying the bandwidth information to an endpoint; aftersending the first plurality of OAM messages carrying the bandwidthinformation to the endpoint, sequentially sending, by the network node,a second plurality of OAM messages carrying the bandwidth information tothe endpoint, wherein the OAM messages of the second plurality of OAMmessages are periodically sent one at a time using a normal period, andwherein OAM messages of the first plurality of OAM messages areperiodically sent one at a time using a period that is smaller than thenormal period.
 2. The bandwidth information notification methodaccording to claim 1, wherein obtaining the bandwidth information of themicrowave link comprises: detecting, by the network node, a modulationmode of the microwave link; and obtaining, by the network node,bandwidth information of the microwave link under the modulation mode.3. The bandwidth information notification method according to claim 2,wherein, before obtaining the bandwidth information of the microwavelink under the modulation mode, the method further comprises determiningwhether the modulation mode is lower than a threshold modulation mode,and wherein obtaining the bandwidth information of the microwave linkunder the modulation mode comprises obtaining the bandwidth informationof the microwave link under the modulation mode when the modulation modeis lower than the threshold modulation mode.
 4. The bandwidthinformation notification method according to claim 1, furthercomprising: detecting, by the network node, a modulation mode of themicrowave link; and stop sending, by the network node, OAM messages forbandwidth notification to the endpoint when it the modulation mode isequal to or greater than a threshold modulation mode.
 5. The bandwidthinformation notification method according to claim 1, furthercomprising: stop sending, by the network node, OAM messages forbandwidth notification to the endpoint when a bandwidth of the microwavelink is within a threshold bandwidth range.
 6. The bandwidth informationnotification method according to claim 1, further comprising: adjusting,by the endpoint, a service policy according to the bandwidthinformation.
 7. The bandwidth information notification method accordingto claim 1, wherein sending, by the network node, the first plurality ofOAM messages to the endpoint comprises sending the first plurality ofOAM messages to the endpoint through another network node, the anothernetwork node positioned between the network node and the endpoint.
 8. Anetwork node, comprising: an obtaining unit, configured to obtainbandwidth information of a microwave link; a sending unit, configuredto: when a bandwidth of the microwave link has changed, sequentiallysend a first plurality of operation, administration and maintenance(OAM) messages carrying the bandwidth information obtained by theobtaining unit to an endpoint; and after sending the first plurality ofOAM messages, sequentially send a second plurality of OAM messagescarrying the bandwidth information to the endpoint, wherein OAM messagesof the second plurality of OAM messages are periodically sent using anormal period, and wherein OAM messages of the first plurality of OAMmessages are periodically sent one at a time using a period that issmaller than the normal period.
 9. The network node according to claim8, wherein the network node further comprises: a detecting unit,configured to detect a modulation mode of the microwave link, whereinthe obtaining unit is configured to obtain bandwidth information of themicrowave link under the modulation mode that is detected by thedetecting unit.
 10. The network node according to claim 9, furthercomprising: a judging unit, configured to determine whether themodulation mode that is detected by the detecting unit is lower than athreshold modulation mode; wherein the obtaining unit is configured to,when the judging unit determines that the modulation mode that isdetected by the detecting unit is lower than the threshold modulationmode, obtain the bandwidth information of the microwave link under themodulation mode that is detected by the detecting unit.
 11. The networknode according to claim 8, wherein the network node further comprises: adetecting unit, configured to detect a modulation mode of the microwavelink; wherein the sending unit is further configured to, when themodulation mode that is detected by the detecting unit is equal to orgreater than a threshold modulation mode, stop sending OAM messages forbandwidth notification to the endpoint.
 12. The network node accordingto claim 8, wherein the sending unit is further configured to stopsending OAM messages for bandwidth notification to the endpoint when abandwidth of the microwave link is within a threshold bandwidth range.13. A communication system, comprising: a network node; a firstendpoint; and a second endpoint, wherein the first endpoint and thesecond endpoint are endpoints of a service connection that passesthrough a microwave link and the network node; wherein the network nodeis configured to obtain bandwidth information of the microwave link, andto sequentially send a first plurality of operation, administration andmaintenance (OAM) messages carrying the bandwidth information to thefirst endpoint in response to determining that a bandwidth of themicrowave link has changed; wherein the network node is furtherconfigured to, after sending the first plurality of OAM messages to thefirst endpoint, sequentially send a second plurality of OAM messages tothe first endpoint, wherein the first plurality of OAM messages is sentmore quickly than the second plurality of OAM messages, and wherein thefirst endpoint is configured to adjust a service policy according to thebandwidth information.
 14. The communication system according to claim13, wherein the network node is further configured to stop sending OAMmessages for bandwidth notification to the first endpoint when abandwidth of the microwave link is within a threshold bandwidth range.15. A non-transitory processor-readable storage medium having storedthereon processor-executable instructions configured to cause aprocessor to perform operations comprising: obtaining, by a networknode, bandwidth information of a microwave link; in response todetermining that a bandwidth of the microwave link has changed, sending,by the network node, a first plurality of operation, administration andmaintenance (OAM) messages carrying the bandwidth information to a firstendpoint; after sending the first plurality of OAM messages to the firstendpoint, sending, by the network node, a second plurality of OAMmessages carrying the bandwidth information to the first endpoint;wherein the first endpoint is an endpoint of a service connectionbetween the first endpoint and a second endpoint, wherein the serviceconnection passes through the microwave link and the network node; andwherein OAM messages of the second plurality of OAM messages areperiodically sent using a normal period and wherein OAM messages of thefirst plurality of OAM messages are periodically sent using a periodthat is smaller than the normal period.
 16. The non-transitoryprocessor-readable storage medium of claim 15, wherein obtaining thebandwidth information of the microwave link comprises: detecting amodulation mode of the microwave link; and obtaining bandwidthinformation of the microwave link under the modulation mode.
 17. Thenon-transitory processor-readable storage medium of claim 16, wherein,before obtaining the bandwidth information of the microwave link underthe modulation mode, the operations further comprise determining whetherthe modulation mode is lower than a threshold modulation mode, andwherein obtaining the bandwidth information of the microwave link underthe modulation mode comprises obtaining the bandwidth information of themicrowave link under the modulation mode when the modulation mode islower than the threshold modulation mode.
 18. The non-transitoryprocessor-readable storage medium of claim 15, wherein the operationsfurther comprise: stop sending OAM messages for bandwidth notificationto the first endpoint when a bandwidth of the microwave link is within athreshold bandwidth range.